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Two opposite and equal charges each of 4...

Two opposite and equal charges each of `4times10^(-8)` placed `2times10^(-2)` cm apart to form a dipole. if this dipole is placed in an external electric field of `4×10^8` N/C , if the value of maximum torque experienced by dipole is `8ktimes10^(-4)` Nm, then the value of k is

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